Insulin stimulates a membrane-bound serine kinase that may be phosphorylated on tyrosine.

Abstract:

:Triton X-100-solubilized high-density microsomes from insulin-treated rat adipocytes exhibit a marked increase in serine/threonine and tyrosine kinase activities toward exogenous histone when compared to controls. The insulin-dependent activation of microsomal histone kinase activities occurs within the physiological range of hormone concentrations (ED50 = 0.6 nM). The hormone-enhanced histone phosphorylation by the high-density microsomes appears to be catalyzed by two distinct kinases, based on their differential interaction with wheat germ agglutinin-agarose. The insulin-sensitive serine/threonine kinase is not retained by The insulin-sensitive serine/threonine kinase is not retained by the lectin column, whereas the tyrosine kinase appears to be a glycoprotein as evidenced by its adsorption to the immobilized lectin. The insulin-stimulated serine/threonine kinase exhibits preferential phosphorylation of histone and Kemptide (synthetic Leu-Arg-Arg-Ala-Ser-Leu-Gly) compared to a number of other peptide substrates. The substrate specificity of this serine/threonine kinase shows that it is distinct from the kinases that phosphorylate ribosomal protein S6, casein, phosvitin, ATP citrate lyase, and glycogen synthase and from multifunctional calmodulin-dependent, cAMP- and cGMP-dependent, and Ca2+/phospholipid-dependent protein kinases. Furthermore, 22% of the insulin-sensitive serine/threonine kinase activity can be adsorbed by monoclonal anti-phosphotyrosine antibodies immobilized on agarose. Its adsorption is specifically inhibited by excess free phosphotyrosine but not phosphoserine or phosphothreonine. The data suggest that this insulin-stimulated serine/threonine kinase in adipocyte high-density microsomes is tyrosine-phosphorylated, consistent with the hypothesis that the stimulatory action of insulin on this kinase may be mediated by tyrosine phosphorylation.

authors

Yu KT,Khalaf N,Czech MP

doi

10.1073/pnas.84.12.3972

subject

Has Abstract

pub_date

1987-06-01 00:00:00

pages

3972-6

issue

12

eissn

0027-8424

issn

1091-6490

journal_volume

84

pub_type

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